Method for preparing nano composite high-absorptivity chrome tanning auxiliary agent by combining polycarboxylic acid copolymer with montmorillonite

Abstract

A method for preparing a nanometer composite highly-absorptive chrome tanning additive by combining polycarboxylic copolymer and montmorillonite. The method comprises: dispersing 2-10 g of nanometer montmorillonite with 150-400 g of distilled water, adding 0.5-1.5g of cetyl trimethyl ammonium chloride, and enabling the reaction thereof for 4-6 h at a temperature between 60°C and 95°C, performing ultrasonic processing for 0.5-2 h to obtain modified montmorillonite; dispersing 2-10 g of modified montmorillonite using 150-300 g of water for 2-5 h, adding 15-30 g of methacrylic acid, reacting for 0.5-2 h, performing water bath heating, and at 50-80°C, continuing dripping methacrylic acid and an initiator for 30 min, reacting at a constant temperature for 1-3 h, cooling, discharging, and producing the final product. In the method, a pickling procedure in the conventional chrome tanning process is omitted, so that the exhaustion rate of chrome tanning waste liquid is increased, and an environmentally friendly nanometer composite material is therefore provided.

Description

technical field [0001] The invention relates to a preparation method of a nano-composite high-absorption chrome tanning auxiliary, in particular to a method for preparing a nano-composite high-absorption chrome tanning auxiliary by combining a polycarboxylic acid copolymer with montmorillonite. Background technique [0002] In tanning production, due to the excellent properties of chrome tanned leather, most of the finished leather is produced by chrome tanning. However, the traditional chrome tanning method has brought serious environmental problems. The absorption rate of chrome tanning agent is not high, only about 60%. The direct discharge of a large amount of chromium-containing waste liquid has caused serious pollution to soil and water; Cr 3+ Oxidized to Cr 6+ It will directly cause damage to human skin and induce various diseases. In addition, my country is short of chromium resources, and chrome tanning agents are almost entirely imported. In recent years, the pr...

AI Technical Summary

Problems solved by technology

However, the traditional chrome tanning method has brought serious environmental problems. The absorption rate of chrome tanning agent is not high, only about 60%. The direct discharge of a large amount of chromium-containing waste liquid has caused serious pollution to soil and water; Cr 3+ Oxidized to Cr 6+ It will directly cause damage to human skin and induce various diseases

In addition, due to the shortage of chrome resources in my country, almost all chrome tanning agents are imported. In recent years, the price of chrome tanning agents has been rising year after year, resulting in a sharp increase in the cost of tanning.

As the main tanning method, the traditional chrome tanning method has faced enormous pressure and challenges